mirror of
https://github.com/michaelcmartin/Ophis.git
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266 lines
4.0 KiB
HTML
266 lines
4.0 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<HTML
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><HEAD
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><TITLE
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>tutor6.oph</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
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REL="HOME"
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TITLE="Programming with Ophis"
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HREF="book1.html"><LINK
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REL="UP"
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TITLE="Example Programs"
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HREF="a454.html"><LINK
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REL="PREVIOUS"
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TITLE="tutor5.oph"
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HREF="x489.html"><LINK
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REL="NEXT"
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TITLE="c64-2.oph"
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HREF="x497.html"></HEAD
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><BODY
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CLASS="SECTION"
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#840084"
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ALINK="#0000FF"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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SUMMARY="Header navigation table"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>Programming with Ophis</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Example Programs</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="x497.html"
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ACCESSKEY="N"
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>Next >>></A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECTION"
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><H1
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CLASS="SECTION"
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><A
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NAME="TUTOR6-SRC"
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><TT
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CLASS="FILENAME"
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>tutor6.oph</TT
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></A
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></H1
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><TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>.include "c64-1.oph"
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.data
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.org $C000
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.space cache 2
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.text
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.macro print
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lda #<_1
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ldx #>_1
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jsr printstr
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.macend
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.macro greet
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lda #30
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jsr delay
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`print hello1
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`print _1
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`print hello2
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.macend
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; Save the zero page locations that PRINTSTR uses.
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lda $10
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sta cache
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lda $11
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sta cache+1
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lda #147
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jsr chrout
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`greet target1
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`greet target2
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`greet target3
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`greet target4
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`greet target5
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`greet target6
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`greet target7
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`greet target8
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`greet target9
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`greet target10
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; Restore the zero page values printstr uses.
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lda cache
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sta $10
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lda cache+1
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sta $11
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rts
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hello1: .byte "HELLO, ",0
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hello2: .byte "!", 13, 0
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target1: .byte "PROGRAMMER", 0
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target2: .byte "ROOM", 0
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target3: .byte "BUILDING", 0
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target4: .byte "NEIGHBORHOOD", 0
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target5: .byte "CITY", 0
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target6: .byte "NATION", 0
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target7: .byte "WORLD", 0
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target8: .byte "SOLAR SYSTEM", 0
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target9: .byte "GALAXY", 0
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target10: .byte "UNIVERSE", 0
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; DELAY routine. Takes values from the Accumulator and pauses
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; for that many jiffies (1/60th of a second).
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.scope
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.data
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.space _tmp 1
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.space _target 1
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.text
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delay: sta _tmp ; save argument (rdtim destroys it)
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jsr rdtim
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clc
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adc _tmp ; add current time to get target
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sta _target
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* jsr rdtim
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cmp _target
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bmi - ; Buzz until target reached
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rts
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.scend
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; PRINTSTR routine. Accumulator stores the low byte of the address,
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; X register stores the high byte. Destroys the values of $10 and
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; $11.
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.scope
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printstr:
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sta $10
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stx $11
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ldy #$00
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_lp: lda ($10),y
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beq _done
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jsr chrout
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iny
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bne _lp
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_done: rts
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.scend
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.checkpc $A000
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.data
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.checkpc $D000</PRE
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></TD
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></TR
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></TABLE
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><DIV
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CLASS="NAVFOOTER"
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><TR
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